一、一般进展情况近十多年来,从事突变育种,开展提高突变率和突变机理研究的地区和国家,已有明显的增加。许多原来很少开展这方面研究的亚非拉国家,如泰国、加纳、墨西哥等,近年来研究进展很快;苏联以及东欧各国的研究工作最近也显得十分活跃;原来研究基础较好的西欧各国,如瑞典、英国、西德、法国以及东方的日本与印度,北美的加拿大与美国,在突变育 I. General Progress Over the past decade or so, there have been marked increases in areas and countries engaged in mutation breeding and research on improving the mutation rate and mutation mechanism. Many countries in Asia, Africa and Latin America such as Thailand, Ghana and Mexico that seldom carried out researches in this field have made rapid progress in recent years. The research work in the Soviet Union and in Eastern European countries has also become very active lately. In the past, Western European countries , Such as Sweden, Britain, West Germany, France, Japan and India in the East, Canada and the United States in North America,